Itdoes not work well in a situation where multiple updates to the VLAN database occur simultaneously
onswitches in the same domain, which would result in an inconsistency in the VLAN database.
•Theswitch supports 1005VLANs whenrunning theIP Liteimage.
•However,the number of routed ports, SVIs, and other configured features affects the usage of the switch
hardware.If the switch is notified by VTP of a new VLAN and the switch is already using the maximum
availablehardware resources, it sends a message that there are not enough hardware resources available
andshuts down the VLAN. The output of the show vlan user EXEC command shows the VLAN in a
suspendedstate.
Information About VTP

VTP

VTPis a Layer 2 messaging protocol that maintains VLAN configuration consistency by managing the
addition,deletion, and renaming of VLANs on a network-wide basis. VTP minimizes misconfigurations and
configurationinconsistencies that cancause several problems,such asduplicate VLAN names,incorrect
VLAN-typespecifications, and securityviolations.
VTPfunctionality is supported across the stack, and allswitches in the stackmaintain the same VLAN and
VTPconfiguration inherited from theactive switch. Whena switch learnsof anew VLANthrough VTP
messagesor when a new VLAN is configured by the user, the new VLAN information is communicated to
allswitches in thestack.
Whena switch joins the stack or when stacks merge, the new switches get VTP information from the active
switch.
VTPversion 1 and version 2 support only normal-range VLANs (VLAN IDs 1 to 1005). VTP version 3
supportsthe entireVLAN range (VLANs 1 to 4094). Extended range VLANs (VLANs 1006 to 4094) are
supportedonly in VTPversion 3. Youcannot convert from VTP version 3 to VTP version 2 if extended
VLANsare configured in thedomain.

VTP Domain

AVTP domain (also called a VLAN management domain) consists of one switch or several interconnected
switchesor switch stacks under thesame administrative responsibility sharing the same VTP domain name.
Aswitch can bein onlyone VTP domain. Youmake global VLAN configuration changes for the domain.
Bydefault, the switch is in the VTP no-management-domain state until it receives an advertisement for a
domainover a trunklink (alink thatcarries the traffic of multiple VLANs) or until you configure a domain
name.Until the management domain name is specified or learned, you cannot create or modify VLANs on a
VTPserver, and VLAN information is not propagated over the network.
Ifthe switch receives a VTP advertisement over a trunk link, it inherits the management domain name and
theVTP configuration revision number. The switch then ignores advertisements with a different domain name
oran earlierconfiguration revision number.
Catalyst 2960-XR Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX1
14 OL-29440-01
Configuring VTP
Information About VTP